Veneer lathe attachment



Feb. 29, 1944. c, s Aw 2,342,701

, VENEER LATHE ATTACHMENT Filed Aug. 13, 1941 2 Sheets-Sheet I i .12 L2K M Claude Shaw ATTORNEYS C. SHAW VENEER LATHE ATTACHMENT Filed Aug. 13,194i 2 Sheets-Sheet 2 Claude QEVQN'T OR AFTORNEYS Feb. 29, 1944;

Patented Feb. 29, 1944 UNITED- STATES OFFICE VENEER LATHE ATTACHMENT;

7 Claudershaw, Bristol, Va. ApplicatiomAugiust .13, 1941;.Seria-LNm406E636;

4 Claims.-

In a" lathe and particularly that of the staylogferm constructed to" beconvertible intoa straight lathe,- the centeris axially adjustable ofthe spindle tobringthe former into engagement with the work. Generallythis adjustment is through'the instrumentalityof a threaded connectionbetween the spindle and the shank of the center but where-the latterprotrudes through the face plate, the sh'ank has a snug bearing in thespindle. In the operation of the lathe; how-' ever, the knife imposes'alateral'strain on the center and this continual pressure results in wearinth-ebore-of the spindle at the face plate end.

After continued use, the spindl'ebore becomes so enlarged at-the endfacing the work that considerable lateral spring' is afforded the centerwith the result'that the-'prescribedthickness of veneer can notbemaintained with regularity. Torepair a spindle-which has beensubjected" to such wear-is-an'expensive procedure and it is the primarypurpose- 0f "the present invention-to provide adjustablemeans forclamping or securing-'the-centertothe spindle, after the former has beenengaged with the work, so'that this tendency to lateral movement of thecenter will be absolutely precluded.

It is a further object ofthe invention to--pro'- vide a clamping meansdemountably carried on the spindle or the face plate thereof andcomprising independently adjustable elements so that the clampingoperation can be effected without danger of deflecting the center out ofits axial coincidence with the spindle.

Further, it is an object of the invention to provide a spindle clampingmeans adaptable for use with convertible stay-log machines andapplicable to the spindle in place and where the arm of the stay-log isengaged with the spindle.

A still further object of the inVention is to provide means of the kindindicated which is of comparatively simple form and thereforesusceptible of cheap manufacture.

With this object in view, the invention consists of a construction andcombination of parts of which preferred embodiments are illustrated inthe accompanying drawings, wherein:

Figure 1 is a side elevational view of one of the heads of a convertiblestay-log lathe showing the invention applied in operative positionthereon.

Figure 2 is a sectional view on the plane indicated by the line 2-2 ofFigure 1.

Figures 3 and 4 are sectional views on the planes indicated by the lines3-3 and 4-4 of Figure 2.

Figure 5 is a view similar to Figure 2 but shows a modified fornr ofmounting the clamping means:

Figured is a sectional view on-the plane indicated by the lined- 45 ofFigure 5.

The convertible stay-Jog machine differs only fromthe straight veneerlathe inthat the'latter hasnowmeans for mounting the stay-logbut isadapted only to support the work on centers and peel off theveneer inribbons; rather than sheets, as in the stay-' log. Where the inventionis used on'a convertible -stay-log machine, it is mounted in the-guidein the-faceplate ii! in which the arnrof the'stay-log-is mounted whenthe machine is-used -as' a stay log'machi ne. The spindle H" is-mountedto 'rotate'in' hearings in the pillow block" I 2" and whilethe faceplate ii! "may be a separate-element secured to the spindle, it isgenerall-y' formed' as a flange at the forward end of the-spindle.-

Thecenter, of which the head !'3 is removably secured at theforward 'endof the shank M, is moved axiallyof the spindle by reason of an internalth'readinthe-latter which is engaged with an external thread" It on thespindle shank at the rearend Where the shank of the center projectsthrough thefaceplate end of the spindle; theb'oreofthelatter issmooth toprovide asnug slide bearing for the shank.-

In -the operationof the-lathe; when the work less mountedon centers, thepressure of the knife imposes a" considerable lateral'pressure on thespindle shanks I4 at points diametrically opposite the point of positionof the knife and this continual lateral pressure results in wearing thebore of the spindle at the end facing the work, so that there can beafter a time, a considerable lateral play of the center shank withresultant defective work in cutting the ribbon of veneer.

But if the shank of the center be rigidly secured to the spindle afterthe work has been mounted, this lateral play is precluded.

In the form of the invention shown, the jaws l1 constitute the means foreffecting a rigid connection between the shank of the center and thespindle, these jaws being mounted in the guideway 18 formed in the faceplate l0. The guideway I8 is designed to receive the arms of thestay-log when the machine is used as a stay-log lathe, being open at oneend and closed at the other end, as indicated in Figure 2, thusproviding a shoulder I9.

The guide I8 is in the form of a dovetail slot of which the walls ofopposite sides are formed of converging lines, so that the one side wallof the slot inclines slightly toward the other. The

undercutting of the side walls to form the dovetail slot constitutesmeans by which the jaws I! are held in the guide, liners beinginterposed between the jaws and the side walls of the guide on the oneside and between the jaws and a gib 2| on the other side. The gib isformed with a slight taper and is longitudinally adjustable by means ofscrew which is threaded into the gib but has a rotary bearing in theblock portion 22 of the face plate, which block portion is socketed, asindicated at 23, so that a wrench may be applied to the wrench seat 24on the adjusting screw.

The liners 20 are tapered and are formed with angular ends 25 formingears through which cap screws 28 pass, the latter threading into thejaws. Obviously the degree to which the cap screws are set determinesthe positions of the liners. The laws, at the side edges, are tapered atan angle corresponding to the taper of the liners 20.

The jaws are adjusted towards each other and thereby brought intoengagement with the shank M of the center by the adjustment of the capscrews 2'! which are larger than the cap screws 26, one of these capscrews abutting the shoulder I9 and the other the shoulder formed by aremovable block 28 secured to the face plate to close the normally openend of the guide. Cap screws 29 secure the block 28 in place.

The gib 2| is adjusted to effect a reasonably snug fit of the jaws inthe guide, proper adjustment of the liners 2B effecting properpositioning of the jaws relative to the shank I4 of the center.

After the center has been engaged with the work, as indicated in Figure1, the rotation of the set screws 21 will cause the jaws I! to be movedtoward each other and thereby brought into engagement with the shank Mof the center, thus effecting a rigid mounting of it in the face plateat the center. The cap screws, abutting the shoulders formed at theclosed end of the guide and by the block 28, constitute the means foradvancing the jaws into clamping engagement with the shank l4. By havingthe jaws independently adjustable, efiective clamping of the shank canbe eilected without disturbance to its axial coincidence with the axisof the spindle.

In the modification shown in Figure 5, the general arrangement of theconstruction of Figures 1 and 2 is adhered to, the jaws I! beingequipped with the liners 20 but the tapering gib being replaced with astraight gib 30, the side walls of the guide lBa. being parallel ratherthan with one of them at a slight inclination toward the other. Setscrews 3| pass through one wall of the guide and bear upon the gib tokeep the latter in place and provide for the proper adjustment alongwith the proper adjustment of the liners for centrally positioning thejaws.

The invention having been described, what is claimed as new and usefulis:

1. A spindle chuck, comprising a spindle, a face plate carried by oneend of the spindle and provided with a guide formed therein of a shapeof a dovetail slot arranged diametrically of the face plate, jawsmounted in the guide, liners adjustably connected to the jaws, and anadjustable gib mounted in the guide and bearing upon the liners at oneside.

2. A spindle chuck, comprising a spindle, a face plate carried by thespindle provided with a guide formed therein of a dovetail slot shapearranged diametrically of the face plate, jaws arranged in the guide,liners adjustably connected with the jaws, and an adjustable gib mountedin the guide and bearing upon the liners at one side, the liners beinglongitudinally tapered.

3. A spindle chuck, comprising a spindle, a face plate carried by thespindle having a guide formed therein of the dovetail slot shapearranged diametrically of the face plate, jaws mounted in the guide,liners adjustably connected with the jaws, and an adjustable gib mountedin the guide and bearing upon the liners at one side, the liners beinglongitudinally tapered and the gib being longitudinally tapered, thewall of the guide adjacent the gib being at a slight inclination to theopposite wall of the guide.

4. A spindle chuck, comprising a spindle, a face plate carried by thespindle having a guide formed therein of the dovetail slot shapearranged diametrically of the face plate, jaws mounted in the guide,liners adjustably connected with the jaws, and an adjustable gib mountedin the guide and bearing upon the liners at one side, the liners beinglongitudinally tapered outwardly towards the spindle and the gibcorrespondingly tapered, the wall of the guide adjacent the gib being ata slight inclination to the opposite wall of the guide.

CLAUDE SHAW.

